An English unit used in pharmaceutical work is the grain (gr). There are 15 grains in 1 gram. An aspirin tablet contains 5.0 gr of aspirin. A 145 lb person takes two aspirin tablets. Calculate the dosage of aspirin, which is the number of milligrams of aspirin per kilogram of body weight.

(1 lb = 453.5 g)

To calculate the dosage of aspirin in milligrams of aspirin per kilogram of body weight, we need to know the mass of aspirin in the tablets taken and the mass of the person taking it.

Let's first convert the mass of aspirin from grains to grams. A single aspirin tablet contains 5.0 grains of aspirin. Since the person has taken two tablets, the total mass of aspirin taken is 2*5.0 = 10.0 grains. Given that 1 grain is equivalent to 1/15th of a gram, we then convert the mass of aspirin into grams: 10.0 grains * 1/15 = 0.6667 grams.

Now, we need to convert the mass of aspirin from grams to milligrams. Since 1 gram equals 1000 milligrams, then 0.6667 grams equals 0.6667 * 1000 = 666.7 milligrams.

Next, we should convert the weight of the person from pounds to kilograms, since the dosage of aspirin is typically given in terms of milligrams of aspirin per kilogram of body weight. The person weighs 145 pounds. Since 1 pound is equivalent to 453.5 grams, we have: 145 pounds * 453.5 = 65857.5 grams. To convert this into kilogram we divide it by 1000, so we have 65.8575 kilograms.

Finally, we calculate the dosage of aspirin in milligrams per kilogram by dividing the total milligrams of aspirin taken by the weight of the person in kilograms: 666.7 milligrams / 65.8575 kilograms = 10.14 mg/kg.

Therefore, the dosage of aspirin is approximately 10.14 milligrams per kilogram of body weight.

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